package org.quickbundle.third.mybatis.dialect;

/**
 * 
 */
public class OracleDialect implements Dialect {

	public String getLimitString(String sql, int offset, int limit) {
		sql = sql.trim();
		boolean isForUpdate = false;
		if (sql.toLowerCase().endsWith(" for update")) {
			sql = sql.substring(0, sql.length() - 11);
			isForUpdate = true;
		}

		StringBuffer pagingSelect = new StringBuffer(sql.length() + 100);
		
		pagingSelect.append("select * from(select row_.*, rownum rownum_ from(");
		
		pagingSelect.append(sql);
		
		pagingSelect.append(")row_)where rownum_>"+offset+" and rownum_<="+(offset + limit));

		if (isForUpdate) {
			pagingSelect.append(" for update");
		}
		
		return pagingSelect.toString();
	}
}
